Breakdown of 〜kai
story of a building
階
A wall surrounds all stories of a building. That's why the roof isn't considered a story.
Usages of 〜kai
一階ikkai
first floor; ground floor
二階nikai
second floor
三階sankai
third floor
四階yonkai
fourth floor
五階gokai
fifth floor
六階rokkai
sixth floor
七階nanakai
seventh floor
八階hakkai
eighth floor
九階kyuukai
ninth floor
十階jukkai
tenth floor
私 の オフィス は 五階 に あります。watashi no ofisu wa gokai ni arimasu.
My office is on the fifth floor.
エレベーター で 六階 に 行って ください。erebeetaa de rokkai ni itte kudasai.
Please go to the sixth floor by elevator.
八百屋 は 一階 に あります。yaoya wa ikkai ni arimasu.
The greengrocer is on the ground floor.
八階 まで エスカレーター が あります。hakkai made esukareetaa ga arimasu.
There is an escalator up to the eighth floor.
何階nankai
what floor
私 の 会社 は この ビル の 三階 に あります。watashi no kaisha wa kono biru no sankai ni arimasu.
My company is on the third floor of this building.
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